Metadata

Coordinates

38.11611, -121.6592528 (decimal degrees)

Elevation

1.52 m below sea level

Map


Deployment Dates

Deployed: 2016-06-17
Removed: 2016-12-02

Sensors Deployed

  • 1 NRLITE2 (Kipp & Zonen) net radiometer mounted at 2.3 m above ground level
  • 2 FW3 (Campbell Scientific) fine-wire thermocouples mounted at 2.2 m above ground level
  • 2 Soil Heat Flux Plates (REBS) inserted at 0.08 m below the soil surface
  • 1 TCAV (Campbell Scientific) set of averaging soil thermocouples with two probes inserted at 0.06 m and two at 0.02 m below the surface
  • 5 CS616 (Campbell Scientific) volumetric water content sensors inserted at 0.21 m (VW_1), 0.42 m (VW_2), 0.53 m (VW_2), 0.80 m (VW_2), and 1.0 m (VW_5) below the soil surface. Sensors were angled slightly downward.
  • 1 81000RE (R.M. Young Inc.) ultrasonic anemometer mounted at 2.8 m above ground level
  • 1 HC2S3 (Rotronic) Temperature/Relative Humidity Probe mounted at 2.2 m above ground level

Notes

  • Surface renewal sensible heat flux measurements were corrected with calibration coefficients developed between surface renewal and eddy covariance measurements.
  • The fenced off location where the station was placed was slightly higher than the surrounding field and there was a bare soil border of about 1 m around the fencing. Vegetation inside the fencing was not as green as the surrounding field. This could make the net radiation observed at this station not representative of the field.

Photographs



Daily Evapotranspiration and Energy Balance Components

Summed daily net radiation (Rn), ground heat flux (G), surface renewal derived sensible heat flux (H SR), eddy covariance derived sensible heat flux (H EC), and the resulting actual evapotranspiration derived from the energy balance residuals (ETa SR and ETa EC).Also plotted is daily reference evapotranspiration provided by Spatial CIMIS (ETo).

Columns plotted: Rn_Avg_gf_mm_Dqc, SR_aH_gf_mm_Dqc, H_ECrot_gf_mm_Dqc, G_gf_mm_Dgf, ET_SR_aH_qc_Dgf, ET_EC_qc_Dgf, ETo_mm


Daily ETa / ETo

Daily calculated ETa divided by daily ETo obtained from Spatial CIMIS

Columns plotted: Ka_SR, Ka_EC


Half-hourly Energy Balance Components

Average net radiation (Rn),calibrated surface renewal derived sensible heat flux from each thermocouple (H Tc and H Tn), average of the sensible heat fluxes measured by each thermocouple (H SR), ground heat flux (G), and sensible heat flux derived from eddy covariance (H EC). Also included are the latent energy fluxes calculated by residual for the surface renewal (LE SR) and eddy covariance (LE EC) sensible heat fluxes.

Columns plotted: Rn_Avg_qc, SR_aH_qc, Tc_aH_qc, Tn_aH_qc, G_qc, H_ECrot_qc, LE_SR_aH_qc, LE_EC_qc


### Calibration of Surface Renewal Sensible Heat Fluxes against Eddy covariance

Average half-hourly sensible heat flux from surface renewal estimates (average of the individual thermocouples) plotted against the half-hourly average H from eddy covariance. The intercept of the the regression line is forced to zero and the slope is the coefficient used to calibrate the surface renewal flux. Half-hours with positive and negative heat fluxes are plotted and calibrated seperately.

Columns plotted: SR_H_qc, H_ECrot_qc


Half-hourly Average Uncalibrated Volumetric Water Content

Half-hourly Average uncalibrated volumetric water content measured by each CS616. Default calibration coefficients given by the instrument manufacturer were applied but lead to unrealistically high VWC seen here. This is likely due to differences between soils in the Delta and the soils the calibration was developed for. Processing of gravimetric moisture measurements that will be used to develop site specific calibrations are still ongoing. Nevertheless, the values presented here give a rough qualitative indication of relative changes in moisture over time and with depth.

Columns plotted: VW_1_qc, VW_2_qc, VW_3_qc, VW_4_qc, VW_5_qc


Half-hourly Average Ground Heat Flux (excluding surface storage)

Half-hourly Average ground heat flux (excluding storage in the surface layer) measured by each heat flux plate

Columns plotted: HFP_1_qc, HFP_2_qc


Half-hourly Average Soil Temperature

Half-hourly Average Soil Temperature

Columns plotted: ST_qc


Half-hourly Average Ground Heat Flux (including storage)

Half-hourly Average Ground Heat Flux (including storage)

Columns plotted: G_1_qc, G_2_qc, G_qc


Half-hourly Average Wind Speed

Half-hourly averaged wind speed measured by the ultrasonic anemometer

Columns plotted: u_bar_qc


Half-hourly Wind Direction

Half-hourly wind direction measured by the ultrasonic anemometer. Note that this has been corrected in post-processing to account for an error in the datalogger program.

Columns plotted: Wdir_qc


Wind Rose Diagrams

Wind rose diagrams showing the distribution of wind direction and speed during daytime and nighttime periods. Wind data over the entire course of measurements were used (July to December).

Columns plotted: Wdir_qc, u_bar_qc


Half-hourly Average Temperature

Half-hourly Average temperature measured by each thermocouple (Tc and Tn), the HC2S3 air temperature probe (Ta), and by the internal datalogger reference (Tpanel). The dewpoint temperature (Td) is calculated from the air temperature and relative humidity measured by the HC2S3.

Columns plotted: Tpanel_qc, Tc0_Avg_qc, Tn0_Avg_qc, Ta_Avg_qc, Td_Avg_qc


Half-hourly Relative Humidity

Half-hourly relative humidity measured by the HC2S3 probe.

Columuns plotted: RH_qc


Half-hourly Average Battery Voltage

Half-hourly datalogger battery voltage.

Columns plotted: BattVolt_Avg_qc